#include <stdio.h>
#include<string.h>

char *fun(char *p1, char *p2){
    int i = 0;
    i = strcmp(p1,p2)
    if(0 == i){
        return (p1);
    }
    else{
        return (p2);
    }
}

int main(){

    char *(*pf)(char *p1, char *p2);
    pf = &fun;
    (*pf)("aa","bb");
    return (0);

}